If you are still experiencing performance issues after 2.5.2c, and if these issues only started happening after the 2.5.2 patch; then please send us an email with your Dxdiag dump and your client.txt file.

How to DxDiag

If you are running Windows 7 or higher:
Press and hold the Windows key, then press R. This should open the Run window.
In the pop-up window enter DxDiag and click Ok.
After the DirectX Diagnostic Tool window opens; Click on, "Save all information", then choose a location to save the text file to.
Once you have the text file, attach it to an email and send it to us at:
techsupport@grindinggear.com
Please include a link to any relevant threads!

Where to find your Client.txt file

This will be located in: *\Grinding Gear Games\Path of Exile\logs

e.g. C:\Program Files (x86)\Grinding Gear Games\Path of Exile\logs

Or for 32bit Windows: C:\Program Files\Grinding Gear Games\Path of Exile\logs